CN102017800A - Organic el display panel - Google Patents

Abstract

Disclosed is an organic EL display panel that has: a substrate having at least two line-shaped color-producing regions; and at least two subpixels arranged in one row in the color-producing regions. The color-producing regions include a color-producing region in which red-light-emitting subpixels are arranged, a color-producing region in which green-light-emitting subpixels are arranged, and a color-producing region in which blue-light-emitting subpixels are arranged. Each subpixel has: a pixel electrode; an organic functional layer formed as a coating on top of the pixel electrode; an opposing electrode disposed on top of the organic functional layer; and a forward-tapered bank that constitutes the wall of the region in which the organic functional layer is formed. Letting the angle of inclination of the surface of said wall on the side of the edge of the substrate be a, and letting the angle of inclination of the surface of said wall on the side of the center of the substrate be ss, a is less than ss for subpixels X arranged in color-producing regions X located on the edge of the substrate.

Description

Organic Electroluminescent Display Panel

technical field

The present invention relates to an organic EL (Electroluminescent: electroluminescence) display panel.

Background technique

The organic EL display panel is a display panel having light-emitting elements (organic EL elements) that utilize the electroluminescence phenomenon of organic compounds.

An organic EL display panel is manufactured by arranging RGB sub-pixels (organic EL elements) in a matrix on a substrate. Organic EL elements of three colors of RGB constitute one pixel. Each organic EL element is manufactured by laminating a pixel electrode (eg, anode), an organic light-emitting layer, and a counter electrode (eg, cathode) on a substrate. In addition, functional layers such as an electron input layer, an electron transport layer, a hole transport layer, or a hole input layer are sometimes laminated.

Organic light emitting elements can be classified into organic light emitting elements R that emit red light, organic light emitting elements G that emit green light, and organic light emitting elements B that emit blue light. In some cases, as an organic light-emitting layer that makes the organic light-emitting layer included in each organic light-emitting element emit white light, white light is colored by a color filter, but it is also possible to arrange an organic light-emitting layer that emits red light for each organic light-emitting element. layer, an organic light-emitting layer that emits green light or an organic light-emitting layer that emits blue light.

For example, a functional layer such as an organic light-emitting layer, a hole input layer, or a hole transport layer is formed by coating a material solution for the functional layer on a substrate and drying it. More specifically, a functional layer formation area is defined for each RGB by a bank made of resin or the like, and a functional layer material liquid is applied and dried in the area defined by the bank to form a functional layer.

In this way, when the functional layer is formed by the coating method, the drying speed of the material liquid of the functional layer may differ between the formation region at the edge of the panel (the region where the functional layer is formed) and the formation region at the center of the panel. The drying speed of the material liquid affects the shape of the dried functional layer. Therefore, if the drying speed of the material liquid is different, the shape profile and film thickness of the formed functional layer will also be different. The uneven film thickness of the functional layer between pixels causes uneven luminance in the display.

In order to solve such a problem, it has been proposed to make the formation area (space where the functional layer is formed) at the edge of the panel larger than the formation area at the center of the panel (for example, refer to Patent Document 1). In Patent Document 1, the formation area of the edge portion of the panel is made larger than the formation area of the central portion of the panel, and the material liquid of the functional layer is increased according to the size of the formation area, so that the formation area of the central portion of the panel and the edge portion of the panel are aligned. The unevenness in the drying speed of the material liquid that occurs between them is corrected.

In addition, a technique has also been proposed in which the amount of solvent contained in the material liquid applied to the forming region at the edge of the panel is larger than the amount of solvent contained in the material liquid applied to the forming region at the center of the panel. The unevenness in the drying speed of the material liquid that occurs between the center of the panel and the edge of the panel is corrected (for example, refer to Patent Document 2).

In addition, a technique has been proposed in which, in order to prevent uneven luminance of a display caused by uneven drying speed between the center portion of the panel and the edge portions of the panel, a technology is proposed in which pixels are arranged in a matrix in color-emitting regions. A region (dummy region) where no pixel electrode is formed is provided on the outer peripheral portion (for example, refer to Patent Document 3 to Patent Document 6).

In this way, if an empty area is provided on the outer periphery of the light-emitting area, and the material liquid is also applied to the empty area, a functional layer with uneven film thickness will be formed in the empty area of the non-light-emitting area, but the material liquid in the light-emitting area in the center of the panel will be reduced. The deviation of the drying speed, so that the film thickness of the functional layer between the pixels becomes uniform. Therefore, uneven brightness of the display can be reduced.

In addition, the shape profile of the functional layer formed by coating differs depending on the type of solute or solvent of the solution and their content ratio. For example, when coating color filters of various colors that form an organic light-emitting element, the solute of the solution to be coated is different for each color. Therefore, when the height of the bank or the angle of the taper angle is the same, the shape of the color filter is likely to be different for each color. Therefore, a technology has been reported to improve the film thickness uniformity of the color filter by changing the height of the bank or the angle of the taper angle for each color of the color filter (for example, refer to Patent Document 7).

In addition, there is known a technique in which one of the pixel electrode or the counter electrode is set as a transparent electrode and the other is set as a reflective electrode in order to improve the light extraction efficiency from the organic EL element. A transparent conductive film is disposed between the electrodes and the organic light-emitting layer by sputtering or the like (for example, refer to Patent Document 8). Furthermore, the optical distance from the organic light-emitting layer to the reflective electrode is adjusted by the transparent conductive film arranged between the reflective electrode and the organic light-emitting layer, and the light reflected by the reflective electrode and directed to the transparent electrode and the light directly directed to the transparent electrode are mutually enhanced. , so that the light extraction efficiency can be improved.

patent documents

Patent Document 1: (Japanese) Unexamined Patent Publication No. 2008-16205

Patent Document 2: (Japanese) Unexamined Patent Publication No. 2006-260779

Patent Document 3: (Japanese) Unexamined Patent Publication No. 2007-103349

Patent Document 4: (Japanese) Unexamined Patent Publication No. 2006-3870

Patent Document 5: Specification of US Patent Application Publication No. 2007/0052199

Patent Document 6: US Patent No. 7459177 Patent Specification

Patent Document 7: (Japanese) Unexamined Patent Publication No. 2007-310156

Patent Document 8: (Japanese) Unexamined Patent Publication No. 2003-272855

However, as in the techniques disclosed in Patent Document 1 or Patent Document 2, even if the unevenness in the drying speed is corrected at the edge and center of the organic EL display, the problem of shape variation of the functional layer between pixels cannot be eliminated. In this way, if the shape of the functional layer varies between pixels, the luminance of the organic EL display panel varies.

Hereinafter, the mechanism of the variation in the shape of the functional layer between pixels will be described with reference to FIGS. 1 to 1D .

FIG. 1A is a cross-sectional view of an organic EL display panel before forming a functional layer. The organic EL display panel shown in FIG. 1A has sub-pixels (organic EL elements) 130R, 130G, and 130B arranged on a substrate 110 . Each sub-pixel has a bank 170 disposed on the substrate 110 . The sub-pixel 130R is a sub-pixel that emits red light, the sub-pixel 130G is a sub-pixel that emits green light, and the sub-pixel 130B is a sub-pixel that emits blue light. The organic EL display panel includes sub-pixels 130RX arranged at the ends of the panel and sub-pixels 130RY arranged at the center of the panel.

FIG. 1B shows a state in which the functional layer material solution 140 is coated on the area defined by the bank 170 , and FIG. 1C shows a state in which the functional layer material liquid 140 is dried in the area defined by the bank 170 . At the edge of the organic EL display panel, the solvent vapor concentration of the material liquid 140 is low, so drying of the material liquid 140 of the functional layer can be accelerated. Since the applied material liquid 140 convects toward the side with a faster drying speed, the material liquid 140 of the functional layer 180 in the sub-pixel 130RX is pulled toward the edge of the panel.

FIG. 1D shows the shape of the functional layer 180 . In addition, FIG. 2A is an enlarged view of the sub-pixel 130RX shown in FIG. 1D , and FIG. 2B is an enlarged view of the sub-pixel 130RY shown in FIG. 1D . As described above, during the drying of the material liquid 140, the material liquid 140 in the sub-pixel 130RX is pulled toward the end side of the panel, so the edge 181 of the end side of the substrate forming the functional layer 180 of the sub-pixel 130RX is higher, On the other hand, the edge 182 on the central side of the substrate is lower. In this way, when the functional layer is formed by the coating method, the functional layer of the sub-pixel arranged at the edge of the substrate is shifted toward the edge of the substrate. Therefore, the film thickness T of the functional layer 180 of the sub-pixel 130RX is also thinner than the film thickness T' of the functional layer 180 of the sub-pixel 130RY.

Contents of the invention

An object of the present invention is to provide a method for making the shapes of functional layers in a display panel uniform, and to provide an organic EL display panel free from uneven brightness.

It was found that in the sub-pixels at the end of the substrate, by adjusting the inclination angle of the wall surface of the coating region defined by the bank, it is possible to correct the deviation in the shape and film thickness of the organic functional layer between pixels, and further studies have been completed. this invention.

That is, the present invention relates to the organic EL display panel described below.

[1] An organic EL display panel includes: a substrate having more than two parallel linear color-emitting areas; and two or more sub-pixels arranged in a row in the color-emitting areas, and the color-emitting areas The area includes: a color-emitting area in which sub-pixels emitting red light are arranged, a color-emitting area in which sub-pixels emitting green light are arranged, and a color-emitting area in which sub-pixels emitting blue light are arranged, and the sub-pixels respectively have: An electrode, which is arranged on the substrate; an organic functional layer, which is coated and formed on the pixel electrode; an opposite electrode, which is arranged on the organic functional layer; In the wall surface of the region where the organic functional layer is formed, the inclination angle of the wall surface on the end portion side of the substrate is set as an inclination angle α in the wall surface of the region where the organic functional layer is formed, and the Among the wall surfaces of the region of the organic functional layer, when the inclination angle of the wall surface on the central side of the substrate is set to an inclination angle β, in the sub-pixels X arranged in the color-emitting region X located at the end of the substrate , the inclination angle α is smaller than the inclination angle β.

[2] In the organic EL display panel as described in [1], the difference between the inclination angle α and the inclination angle β in the sub-pixel X is greater than the light of the same color as that emitted by the sub-pixel X and is arranged in the The difference between the inclination angle α and the inclination angle β in the sub-pixel Y of the color-emitting region Y located in the central portion of the substrate.

[3] In the organic EL display panel described in [1] or [2], a region where the organic functional layer of each of the sub-pixels is formed is surrounded by the banks.

[4] In the organic EL display panel as described in [1] or [2], the region where the organic functional layer of the two or more sub-pixels arranged in a row in the color-emitting region is formed is composed of A linear area defined by the bank.

[5] In the organic EL display panel according to [4], in one of the linear color-emitting regions, the region of the organic functional layer of the sub-pixel located in the center of the linear direction is formed The inclination angle of the wall surface is larger than the inclination angle of the wall surface in a region where the sub-pixel located at the end in the line direction has the organic functional layer.

[6] The organic EL display panel according to any one of [1] to [5], wherein the organic functional layer includes an organic light emitting layer and a hole transport layer.

According to the present invention, the organic functional layer is prevented from being biased toward the substrate end in sub-pixels at the substrate end, so that the shape and film thickness of the organic functional layer between pixels can be made uniform, and an organic EL display panel with uniform brightness can be provided.

Description of drawings

1A to 1D are diagrams showing changes in a material solution of a functional layer when the functional layer is formed by a coating method.

2A and 2B are diagrams showing functional layers formed by a coating method.

3A and 3B are diagrams showing an organic EL display panel according to Embodiment 1. FIG.

4A and 4B are cross-sectional views of sub-pixels included in the organic EL display panel of Embodiment 1. FIG.

5A to 5D are diagrams showing a method of forming a bank.

6A to 6C are diagrams showing changes in the material liquid of the organic functional layer during the drying process.

7A to 7E are diagrams showing changes in the material liquid of the organic functional layer during the drying process.

8A and 8B are diagrams showing drying center points.

9A and 9B are diagrams showing an organic EL display panel according to Embodiment 2. FIG.

10A and 10B are cross-sectional views of linear coating regions included in the organic EL display panel according to the second embodiment.

11A and 11B are diagrams showing an organic EL display panel according to Embodiment 3. FIG.

12A and 12B are cross-sectional views of sub-pixels included in the organic EL display panel according to Embodiment 3. FIG.

Explanation of reference signs

100, 101, 102, 103, 104, 105, 106, 107, 108, 200, 300 organic EL display panels

110 substrate

120 hair color areas

130 sub-pixels

140 Material solutions for organic functional layers

141 The tip of the droplet

150, 450 pixel electrodes

160 metal oxide film

170 lattice dikes

171 photosensitive resin film

173 linear dike

175, 176 coating area

180 organic functional layers

181 The edge of the substrate end side of the organic functional layer

182 The edge of the substrate center side of the organic functional layer

190 halftone masks

Detailed ways

The organic EL display panel of the present invention includes a substrate and a plurality of sub-pixels (organic EL elements) arranged on the substrate.

[substrate]

The substrate has a plurality of linear color-producing regions parallel to each other. Here, the color-emitting area refers to an area in which sub-pixels of red (R), green (G), and blue (B) are arranged in a row. That is to say, three kinds of color-emitting regions (R, G, B) are arranged parallel to each other on the substrate. For example, a green-colored area is arranged next to the red-colored area, a blue-colored area is arranged next to the green-colored area, and a red-colored area is arranged next to the blue-colored area.

In addition, in the present invention, the color-emitting region located at the end of the substrate is called "color-emitting region X", and the sub-pixels arranged in the center of the substrate and emitting the same color light as the sub-pixels arranged in the color-emitting region X are called "color-emitting region X". The color-emitting area of the pixel is referred to as "color-emitting area Y". Here, the "end portion of the substrate" does not refer only to the peripheral edge portion of the substrate, but also refers to a region located relatively outside of the "central portion of the substrate". Similarly, "the center of the substrate" does not mean only the center of the substrate, but also refers to a region located relatively to the center of the "edges of the substrate". That is, "the edge of the substrate" and "the center of the substrate" determine the relative positional relationship between the two regions to be compared.

Whether the organic EL display panel of the present invention is a bottom emission type or a top emission type depends on the material of the substrate. When the organic EL display panel of the present invention is a bottom emission type, the material of the substrate is not particularly limited as long as it is transparent and an insulator. Examples of such materials include glass, transparent resin, and the like. On the other hand, when the organic EL display panel of the present invention is a top emission type, the material of the substrate is not particularly limited as long as it is an insulator. The size and thickness of the substrate may be appropriately set according to the size of the organic EL display panel to be manufactured, the material of the substrate, and the like.

The substrate may also have a thin film transistor (driving TFT) for driving the organic EL element. A source electrode or a drain electrode of the TFT is connected to a pixel electrode described later.

[subpixel]

As described above, the subpixels (organic EL elements) include subpixels that emit red light, subpixels that emit green light, and subpixels that emit blue light. Sub-pixels emitting these three colors (RGB) constitute one pixel.

In addition, in the present invention, the sub-pixels arranged in the color-emitting region X located at the edge of the substrate are referred to as “sub-pixel X”, and the sub-pixels arranged in the color-emitting region Y in the center of the substrate are referred to as “sub-pixels”. Pixel Y". Sub-pixel X and sub-pixel Y emit light of the same color.

The sub-pixels arranged on the substrate respectively include: 1) a pixel electrode, 2) a bank, 3) an organic functional layer, and 4) a counter electrode. Hereinafter, each component will be described.

1) Pixel electrode

The pixel electrode is a conductive member arranged on the substrate. The pixel electrode normally functions as an anode, but may also function as a cathode. In addition, a film made of transition metal oxide (for example, tungsten oxide, molybdenum oxide, etc.) may be formed on the surface of the pixel electrode. The transition metal oxide film on the surface of the pixel electrode functions as a hole input layer.

According to whether the organic EL display panel of the present invention is a bottom emission type or a top emission type, the material of the pixel electrode is different. When the organic EL display panel of the present invention is a bottom emission type, the material of the pixel electrodes is not particularly limited as long as it is transparent and a conductor. Examples of such materials include ITO (indium tin oxide), IZO (indium zinc oxide), ZnO (zinc oxide), and the like. On the other hand, when the organic EL display panel of the present invention is a top emission type, the material of the pixel electrodes is not particularly limited as long as it has light reflectivity and is a conductor. Examples of such materials include: silver-containing alloys, more specifically silver-palladium-copper alloy (APC), silver-ruthenium-gold alloy (ARA), MoCr (molybdenum chromium), NiCr (nickel chromium), Aluminum-Neodymium alloy (Al-Nd), etc. In addition, an ITO film or an IZO film may be formed on the surface of the light reflective pixel electrode.

2) Dike

The bank constitutes a wall surface of a region where the organic functional layer is formed by coating (hereinafter also referred to as “coating region”), and defines the coating region. In the present invention, the banks may define the coating area in a matrix or linearly.

When the banks define the coating area in a matrix, the organic EL display panel has grid-like banks (see FIG. 3A ), and the coating area of each sub-pixel is surrounded by the banks. On the other hand, when the banks define a linear coating area, the organic EL display panel has a plurality of linear banks, and the coating area of a plurality of sub-pixels arranged in a row in the color-emitting area constitutes a linear coating area. A linear coating area defined by the bank (see FIG. 9A ).

The height of the bank from the surface of the substrate is preferably 0.1 to 3 μm, particularly preferably 0.8 μm to 1.2 μm. When the height of the bank is 3 μm or more, the step coverage of one counter electrode shared by all the organic EL elements described later may be reduced. In addition, when the height of the bank is less than 0.1 μm, the ink coated in the coating area defined by the bank may leak from the bank.

Furthermore, it is preferable that the shape of the bank is a forward taper. The normal taper shape refers to a shape in which the side of the bank is inclined and the area of the bottom surface of the bank is larger than the area of the upper surface of the bank. Preferably, the taper angle of the bank is 80° or less. When the taper angle of the bank exceeds 80°, the step coverage of the counter electrode described later decreases.

Examples of the material of the banks include insulating resins such as polyimide. Preferably, the surface of the bank is less hydrophilic (for example, waterproof). In order to make the surface of the bank less hydrophilic, for example, the material of the bank may be a fluorine-containing resin containing a fluorine compound, or the surface of the bank may be fluorinated by fluorine-based gas plasma.

Examples of fluorine compounds containing fluorine-containing resins include fluorinated resins such as vinylidene fluoride, vinyl fluoride, trifluoroethylene, and copolymers thereof. In addition, examples of resins containing fluorine-containing resins include phenol-novolac resins, polyvinylphenol resins, acrylate resins, and methacrylate resins. , and combinations thereof.

More specific examples of fluorine-containing resins include, for example, LUMIFLON (a registered trademark of Asahi Glass Co., Ltd.), which is a copolymer of a fluorine-containing polymer (fluoroethylene) and vinyl ether described in Japanese Patent Application Publication No. 2002-543469.

The banks are formed by, for example, photolithography. The method for forming a bank by photolithography, for example, includes the following steps: i) forming a photosensitive resin film on a substrate; ii) exposing the formed photosensitive resin film; iii) developing the exposed photosensitive resin film. and iv) baking the patterned resin film to fix the resin film on the substrate (see FIGS. 5A to 5D ).

The present invention is characterized by the inclination angle of the wall surface of the coating region of the sub-pixel X located in the color-emitting region X located at the edge of the substrate. In the present invention, "the wall surface of the coating region" refers to the wall surface parallel to the line direction of the light emitting region among the wall surfaces of the coating region. In the present invention, among the wall surfaces parallel to the linear direction of the color-producing region, the wall surface on the substrate end side is referred to as "wall surface W1", and the wall surface on the substrate center side is referred to as "wall surface W2". In addition, the inclination angle of the wall surface W1 is called "inclination angle α", and the inclination angle of the wall surface W2 is called "inclination angle β".

In addition, the so-called "coating area of a sub-pixel" means that when each sub-pixel has a coating area surrounded by banks, each coating area is surrounded by banks (see FIG. 3A); When the coating area of a plurality of sub-pixels in the color-emitting area constitutes a linear coating area, each area obtained by dividing the linear coating area equally by the number of sub-pixels arranged in the color-emitting area (Refer to FIG. 9A).

Specifically, the present invention is characterized in that in the sub-pixel X, the inclination angle α of the wall surface W1 is smaller than the inclination angle β of the wall surface W2. The inclination angle α in the sub-pixel X is 20° to 60°, and the inclination angle β of the wall surface W2 is 40° to 70°. In addition, in the sub-pixel X, the maximum value of the difference between the inclination angle α and the inclination angle β is 10° to 50°.

In addition, the present invention is characterized in that the inclination angle of the wall surface of the coating region of the sub-pixel is adjusted according to the position of the color emitting region. Specifically, the inclination angle α and the inclination angle β of the sub-pixel Y located in the color-emitting region Y at the center of the substrate are 40° to 70°. That is, the difference between the inclination angle α and the inclination angle β is large in the sub-pixel X, but the difference between the inclination angle α and the inclination angle β is small or has no difference in the sub-pixel Y.

In this way, in order to adjust the inclination angle of the wall surface of the application area, it is only necessary to adjust the taper angle of the banks constituting the wall surface of the application area. In order to adjust the taper angle of the banks, it is sufficient to adjust the exposure intensity when exposing the photosensitive resin film. For example, the material of the photosensitive resin film is set to photocurable resin, and the area where the angle of the taper angle is expected to be smaller is processed with the weak light that has passed through the multi-level mask (grayscale mask or halftone mask). Just exposure (refer to FIG. 5B ).

In this way, by adjusting the inclination angle of the wall surface of the coating region of the sub-pixel, the variation in the shape and film thickness of the organic functional layer between pixels caused by uneven drying is corrected. In Embodiment 1, a mechanism for correcting variations in shape and film thickness of an organic functional layer will be described in detail with reference to the drawings.

3) Organic functional layer

The organic functional layer is a layer that is disposed on the pixel electrode and includes at least an organic light emitting layer. In the present invention, the organic functional layer is formed by coating the material liquid of the organic functional layer in the coating area defined by the bank. For example, it is possible to apply a material solution (a solution obtained by dissolving the material of the organic functional layer in an organic solvent such as anisole or cyclohexylbenzene) by a coating method (for example, an inkjet method) and make it dried, thereby forming an organic functional layer. The thickness of the organic functional layer is not particularly limited, but may be, for example, about 50 nm to 200 nm.

The organic EL material contained in the organic light-emitting layer of the organic functional layer is appropriately selected for each sub-pixel according to the color (RGB) of light emitted by the sub-pixel (organic EL element). The organic EL material may be either a high-molecular organic EL material or a low-molecular organic EL material, but is preferably a high-molecular organic EL material from the viewpoint of being formed by a coating method. The reason for this is that by using a polymeric organic EL material, an organic light-emitting layer can be easily formed without damaging other components. Examples of polymer organic EL materials include: polyphenylene vinylene and its derivatives, polyacetylene and its derivatives, polyphenylene (PP) and its derivatives, polyparaphenylene ethylene And its derivatives, poly-3-hexyl thiophene (Poly-3-hexyl thiophene (P3HT)) and its derivatives, polyfluorene (polyfluorene (PF)) and its derivatives, etc. Examples of low-molecular-weight organic EL materials include tris(8-quinolinolate)aluminum ( _{tris(8-quinolinolate)aluminum} ) and the like.

The organic functional layer may have a hole input layer, a hole transport layer (interlayer), an electron input layer or an electron transport layer, etc. in addition to the organic light emitting layer.

The hole input layer includes, for example, poly(3,4-ethylenedioxythiophene) doped with polystyrene sulfonate (referred to as PEDOT-PSS) or derivatives thereof (copolymer, etc.). Such a hole input layer is formed by, for example, coating a material liquid (ink containing PEDOT-PSS and water) for the hole input layer on the pixel electrode.

A hole transport layer is disposed between the pixel electrode (or hole input layer) and the organic light emitting layer. The hole transport layer has a function of efficiently transporting holes to the organic light-emitting layer, and has a function of preventing electrons from entering the pixel electrode (or the hole input layer). The material of the hole transport layer is preferably a copolymer of polyfluorene and a triphenylamine derivative.

The hole transport layer can be obtained by coating the material solution of the hole transport layer (for example, dissolving the material of the hole transport layer in an organic solvent such as anisole or benzene ring) on the pixel electrode (or hole input layer). solution) to form. The thickness of the hole transport layer is not particularly limited, but may be, for example, about 10 nm to 40 nm.

When the organic functional layer has a hole input layer or a hole transport layer, etc., the pixel electrode can be set as a reflective electrode, and the organic light-emitting layer and the reflective anode, that is, the pixel, can be adjusted by coating the formed hole input layer or hole transport layer. Optical distance between electrodes. In particular, even if the thickness of the hole transport layer is slightly increased or decreased, the light-emitting characteristics of the organic EL device will not be greatly affected, so it is preferably used as a layer for adjusting the optical distance. By coating the formed hole input layer, hole transport layer, etc. to adjust the optical distance, the light extraction efficiency of the organic EL element can be improved. When the optical distance is adjusted by the hole input layer or the hole transport layer, since the optimum optical distance differs depending on the wavelength of light, the film thickness of the hole input layer or the hole transport layer is different for each RGB, and for each RGB, the film thickness of the organic functional layer is different.

On the other hand, it is preferable that the thickness of the organic functional layer of the sub-pixels emitting the same color be uniform. This is because if the film thickness of the organic functional layers of sub-pixels that emit light of the same color varies, unevenness in luminance occurs in the organic EL display panel. Especially when the optical distance is adjusted by the organic functional layer as described above, if the film thickness of the organic functional layer of the sub-pixels emitting the same color varies, a sub-pixel whose optical distance is appropriately adjusted and an optical distance difference between sub-pixels will occur. With properly adjusted sub-pixels, the brightness unevenness of the organic EL display panel is particularly obvious.

Here, the "thickness of the organic functional layer" refers to the thickness of the thinnest part of the organic functional layer of each sub-pixel (see FIGS. 4A and 4B ).

4) Counter electrode

The counter electrode is a conductive component arranged on the organic functional layer. The counter electrode usually functions as a cathode, but may also function as an anode. A plurality of sub-pixels may share one counter electrode. For example, when the organic EL display panel is an active matrix type, all sub-pixels included in one panel may share one counter electrode.

Depending on whether the organic EL display panel of the present invention is a bottom emission type or a top emission type, the material of the counter electrode is different. When the organic EL display panel of the present invention is a top emission type, the material of the counter electrode is not particularly limited as long as it is transparent and a conductor. Examples of such materials include ITO, IZO, ZnO, and the like. On the other hand, when the organic EL display panel of the present invention is a bottom emission type, the material of the pixel electrode is not particularly limited as long as it is a conductor. Examples of such materials include barium, barium oxide, or aluminum.

A sealing film may also be arranged on the counter electrode. The sealing film has a function of protecting organic functional layers, pixel electrodes, and the like from moisture, heat, shock, and the like. Examples of the material of the sealing film include silicon nitride, silicon oxynitride, and the like.

Hereinafter, embodiments of the organic EL display panel of the present invention will be described with reference to the drawings. However, the present invention is not limited by these embodiments.

(Embodiment 1)

3A is a plan view of organic EL display panel 100 according to Embodiment 1 of the present invention. In addition, FIG. 3B is a cross-sectional view of the organic EL display panel 100 according to Embodiment 1 along line AA.

As shown in FIG. 3A and FIG. 3B , the organic display panel 100 includes: a substrate 110 having a plurality of color-emitting regions 120 parallel to each other; in a row.

The color-emitting region 120 includes a color-emitting region 120R in which sub-pixels 130R emitting red light are arranged, a color-emitting region 120G in which sub-pixels 130G emitting green light are arranged, and a color-emitting region 120B in which sub-pixels 130B emitting blue light are arranged. One pixel is constituted by the sub-pixel 130R, the sub-pixel 130G, and the sub-pixel 130B.

In addition, the color-emitting regions 120 include color-emitting regions 120X (120RX, 120GX, 120BX) located at the ends of the substrate 110 and color-emitting regions 120Y (120RY, 120GY, 120BY) located at the center of the substrate 110 . Sub-pixels 130X (130RX, 130GX, 130BX) are arranged in the color-emitting region 120X, and sub-pixels 130Y (130RY, 130GY, 130BY) are arranged in the color-emitting region 120Y (see FIG. 3B ).

As shown in FIG. 3B , each sub-pixel 130 includes: a pixel electrode 150 disposed on the substrate 110 , a metal oxide film 160 disposed on the pixel electrode, a bank 170 defining a coating region 175 , and a bank 170 formed on the coating region 175 . The inner organic functional layer 180 and the counter electrode 190 (not shown) disposed on the organic functional layer 180 . The organic functional layer 180 is disposed on the metal oxide film 160 .

The wall surface of the coating region 175 is formed by the side surfaces of the bank 170 . In addition, in the present embodiment, the banks 170 are formed in a lattice shape, and each sub-pixel 130 has a coating region 175 surrounded by the banks 170 .

The metal oxide film 160 is, for example, tungsten oxide, and functions as a hole input layer.

The organic functional layer 180R of the sub-pixel 130R includes an organic light-emitting layer emitting red light; the organic functional layer 180G of the sub-pixel 130G includes an organic light-emitting layer emitting green light; organic light-emitting layer.

FIG. 4A is an enlarged view of the sub-pixel 130RX shown in FIG. 3B , and FIG. 4B is an enlarged view of the sub-pixel 130RY shown in FIG. 3B .

As shown in FIG. 4A , in the sub-pixel 130RX, the inclination angle α of the wall W1 is smaller than the inclination angle β of the wall W2 . On the other hand, as shown in FIG. 4B , in the sub-pixel 130RY, the inclination angle α of the wall surface W1 is substantially the same as the inclination angle β of the wall surface W2 .

Therefore, the difference between the tilt angle α and the tilt angle β in the sub-pixel 130RX is greater than the difference between the tilt angle α and the tilt angle β in the sub-pixel 130RY.

Next, a method of forming bank 170 constituting the wall surface of coating region 175 by photolithography will be described with reference to the drawings. 5A to 5D show the steps of a method of forming the bank 170 of the sub-pixel 130RX arranged at the end of the substrate 110 .

As shown in FIGS. 5A to 5D , the forming method of the bank 170 includes: 1) a first step, forming a photosensitive resin film 171 on the substrate 110 ( FIG. 5A ); 2) a second step, forming a photosensitive resin film 171 on the substrate 110; Expose; 3) the third step, developing the exposed photosensitive resin film 171, and patterning the photosensitive resin film 171 (FIG. 5C); and 4) the fourth step, patterning the patterned resin The film 171 is baked, fixing it on the substrate 110 (FIG. 5D).

1) Figure 5A shows the first step. As shown in FIG. 5A , in a first step, a photosensitive resin film 171 is formed on the substrate 110 on which the pixel electrode 150 covered with the metal oxide film 160 is disposed. In this embodiment, an example in which the photosensitive resin is a photocurable resin (negative photoresist) is described, but the photosensitive resin may be a positive photoresist.

In order to form the photosensitive resin film 171 on the substrate 110, the photosensitive resin composition is coated on the substrate 110 by spin coating (spin-coating), die coating method, slit coating, etc., and pre-baking the coated film. film. The pre-baking conditions are not particularly limited, and it can be placed at 80° C. to 100° C. (for example, 100° C.) for 2 minutes to 3 minutes.

2) Figure 5B shows the second step. In the second step, as shown in FIG. 5B, the photosensitive resin film 171 is exposed to light. More specifically, light is irradiated to the region to be the bank 170 in the photosensitive resin film 171 . In the present embodiment, the weak light passing through the halftone mask 190 is irradiated to the region 171a constituting the wall surface W1 in the region of the photosensitive resin film 171 serving as the bank 170, and the other regions 171b are not masked. And shine bright light.

The photosensitive resin is hardened by light irradiation, and the elasticity and glass transition temperature of the photosensitive resin rise. The degree of hardening depends on the intensity of the irradiated light, so the resin in the area 171a irradiated with weak light is less hardened, and the resin in the area 171b irradiated with strong light is more hardened.

3) Figure 5C shows the third step. As shown in FIG. 5C, in the third step, the exposed photosensitive resin film 171 is developed. In order to develop the photosensitive resin film 171, the substrate 110 on which the exposed photosensitive resin film 171 is disposed is soaked in 0.2% TMAH (tetramethylammonium hydroxide) solution for 60 minutes, and then rinsed with pure water for 60 minutes. seconds.

As described above, in the region 171a irradiated with weak light, the degree of hardening is small, so in the developing step, the edge of the resin film 171 is chipped, and the inclination angle α of the side surface of the resin film 171 becomes small. On the other hand, in the region 171b irradiated with strong light, the degree of hardening is large, so the edge of the resin film 171 is difficult to be chipped in the developing step, and the inclination angle β of the side surface of the resin film 171 becomes large.

4) Figure 5D shows the fourth step. As shown in FIG. 5D , in the fourth step, the patterned resin film 171 is fired (post-baked) to be fixed on the substrate 110 . The post-baking conditions are not particularly limited, but for example, the temperature is about 200 degrees (for example, 220 degrees) or higher, and the time is about 1 hour. By post-baking the patterned resin film 171 , the solvent and moisture in the resin film 171 are removed, and the adhesiveness between the resin film 171 and the substrate is improved, and the resin film 171 is fixed on the substrate 110 . The resin film 171 fixed on the substrate 110 constitutes the bank 170 .

Thus, by locally adjusting exposure conditions when forming bank 170 by photolithography, it is possible to adjust the taper angle of bank 170 and adjust the inclination angle of the wall surface of coating region 175 .

In this way, in the sub-pixel 130X, by making the inclination angle α smaller than the inclination angle β, it is possible to correct the variation of the organic functional layer 180X included in the sub-pixel 130X. As a result, the film thickness of the organic functional layer 180 included in the sub-pixel 130X arranged at the end of the substrate 110 can be made uniform, and the variation in the film thickness of the organic functional layer 180 between pixels can be corrected.

In the following, the change of the material liquid of the organic functional layer coated in the coating area defined by the bank during the drying process is described, and the organic functional layer can be adjusted by adjusting the inclination angle of the wall surface of the coating area. The mechanism by which the film thickness of the layer is uniform.

FIGS. 6A to 6C and FIGS. 7A to 7E are schematic diagrams showing basic changes of the material liquid during the drying process.

FIG. 6A is a schematic diagram showing a state immediately after the material solution 140 for the organic functional layer is coated in the coating area 175 defined by the bank 170 . As shown in FIG. 6A , the material liquid 140 overflows from the coating area 175 to be coated on the upper surface of the bank 170 . Immediately after coating, the contact angle of the droplet end 141 is θ due to the equalization of surface tension in the droplet end 141 .

After the material liquid 140 starts to dry, while maintaining the equilibrium of the surface tension, as shown in FIG. 6B , in the state where the droplet end 141 is fixed, the angle of collision decreases from θ to the receding angle θ _R due to the evaporation of the solvent. until. This drying mode is called a CCR (Constant Contact Radius: Constant Contact Radius) mode because the diameter of the droplet is constant.

In addition, the receding angle θ _R varies depending on the properties of the material liquid (viscosity, etc.) or the physical properties of the bank surface (surface free energy, etc.).

When the contact angle of the droplet end 141 decreases to the receding contact angle θ _R , the equilibrium of the surface tension in the droplet end 141 collapses, and a force for sucking the material liquid 140 inside is generated. As a result, as shown in FIG. 6C , in the state where the contact angle θ _R is fixed, the droplet end 141 moves inward due to the evaporation of the solvent, and the diameter of the droplet decreases. This drying mode is called a CCA (Constant Contact Angle: Constant Contact Angle) mode because the contact angle with the upper surface of the bank 170 is constant. The droplet diameter decreases until the droplet end 141 reaches the corner of the bank 170 (the boundary line between the upper surface of the bank and the wall surface).

After the droplet end 141 reaches the corner of the bank 170, as shown in Figure 7A, the reference plane of the contact angle changes from the upper surface of the bank to the side of the bank (the wall surface of the coating area), so the contact angle increases as θ'. Thereby, since the collision angle is larger than the receding contact angle, the surface tension of the droplet end 141 is equalized again. As a result, as shown in FIG. 7B , in the state where the droplet tip 141 is fixed on the corner of the bank 170, due to the evaporation of the solvent, the collision angle decreases from θ' to the receding contact angle θ _R ' (CCR model).

When the contact angle decreases to the receding contact angle θ _R ', as shown in FIG. 7C , in the state after the contact angle θ _R ' is fixed, due to the evaporation of the solvent, the droplet tip 141 moves and the volume of the droplet decreases (CCA model).

When the solute concentration near the droplet end 141 reaches a critical concentration due to drying, the material solution 140 is gelled as shown in FIG. 7D , and the droplet end 141 is fixed on the wall surface of the coating region. Such determination of the position of the droplet tip is referred to as "pinning". In particular, pinning caused by an increase in the concentration (increase in viscosity) of the material liquid is called "self pinning". After being locked, as shown in FIG. 7E , the droplet end 141 continues to dry in a fixed state to form an organic functional layer 180 .

As mentioned above, in the application area, the drying of the solution continues in the alternating repetition of the CCR mode and the CCA mode.

Here, when the inclination angle of the wall surface of the application region is made small, the collision angle of the droplet end 141 becomes small when the wall surface is used as a reference plane. Therefore, immediately after the solvent evaporates, the contact angle of the droplet end 141 reaches the receding contact angle θ _R ', the droplet end 141 moves, and the time for the volume of the droplet to decrease (CCA mode drying) becomes longer. In the CCA mode, when the drying time is long, the droplet end 141 moves to the lower part of the wall surface of the coating area until the solute concentration near the droplet end 141 reaches the critical concentration. As a result, the height of the position where the droplet end 141 is fixed on the wall surface of the coating region (the height of the edge of the organic functional layer) becomes low.

As described above, in the sub-pixel 130X arranged at the end of the substrate 110, the edge of the organic functional layer 180X on the edge of the substrate 110 becomes higher due to uneven drying speed, and the organic functional layer 180X is biased toward the substrate 110. side of the end (refer to Figure 2).

However, as in the present embodiment, by making the inclination angle α smaller than the inclination angle β in the sub-pixel 130X, the height of the edge of the organic functional layer 180X on the wall surface W1 of the coating region can be reduced, and the deflection of the organic functional layer 180X can be adjusted. Calibrate (see Figure 4A).

On the other hand, in the sub-pixel 130Y at the center of the substrate, since the organic functional layer is not deflected, even if the inclination angle α and the inclination angle β are the same, an organic functional layer 180 having a uniform film thickness can be obtained (see FIG. 4B ). . As a result, the film thickness T of the organic functional layer 180X included in the sub-pixel 130RX is the same as the film thickness T' of the organic functional layer 180Y included in the sub-pixel 130RY (see FIGS. 4A and 4B ).

In this way, according to this embodiment, by adjusting the inclination angle of the wall surface of the coating region of the sub-pixel, the deviation of the organic functional layer generated in the sub-pixel located at the end of the substrate can be corrected, so that the sub-pixel located at the end of the substrate can be corrected. The film thickness of the organic functional layer of the sub-pixel is uniform. As a result, variations in the film thickness of the organic functional layer between pixels can be corrected. Accordingly, it is possible to provide an organic EL display panel having the same film thickness between pixels.

In addition, in the present embodiment, it is preferable that the difference between the inclination angle α and the inclination angle β (hereinafter, simply referred to as “angle difference”) in the sub-pixel gradually decreases toward the dry center point. Here, the "drying center point" refers to a virtual point at which the drying rate of the coated organic functional layer is the slowest in the manufacturing steps of the organic EL display panel. Sometimes the dry center point is inside the panel, but sometimes it is outside the panel.

For example, as shown in FIG. 8A , when one organic EL display panel 100 is manufactured from one substrate 110 , the drying center point C is located at the center of the organic EL display panel 100 . At this time, the angular difference among the sub-pixels arranged at the peripheral ends (100a, 100b, 100c, and 100d) of the organic EL display panel 100 is the largest, and the angular difference among the sub-pixels gradually decreases as the dry center point C approaches. .

On the other hand, as shown in FIG. 8B , when a plurality of (for example, eight) organic EL display panels ( 101 to 108 ) are manufactured from one substrate 110 , the drying center point C may be located outside the organic EL display panels. At this time, for example, focusing on the organic EL display panel 101, the angular difference between the sub-pixels 101a and 101d arranged at the peripheral edges (101a, 100b, 101c, and 101d) of the organic EL display panel 101 is the largest. As the center point C dries, the angle difference among the sub-pixels gradually becomes smaller. Even in such a case, the angular difference between the sub-pixels arranged at the edge portions 101 a and 101 d of the panel is larger than the angular difference between the sub-pixels arranged at the center of the panel 101 and emitting light of the same color.

(Embodiment 2)

In Embodiment 1, the mode in which the banks define the application area in a matrix has been described. In Embodiment 2, a mode in which the banks define the linear application region will be described.

9A is a plan view of an organic EL display panel 200 according to Embodiment 2. FIG. FIG. 9B is a cross-sectional view along line AA of the organic EL display panel 200 shown in FIG. 9A. The same reference numerals are attached to the same constituent elements as those of the organic EL display panel 100 , and description thereof will be omitted. As shown in FIGS. 9A and 9B , the organic EL display panel 200 has a plurality of linear banks 173 parallel to each other instead of the grid-shaped banks.

The linear bank 173 defines a linear coating area 176 . The linear coating area 176 defined by the linear bank 173 is shared by the plurality of sub-pixels 130 arranged in the color emitting area 120 . In addition, the organic functional layer 180 is linearly formed in the linear application region 176 defined by the linear bank 173 . Therefore, the arranged sub-pixels 130 share one linear organic functional layer 180 .

As shown in FIG. 9B , also in the organic EL display panel 200 , as in the organic EL display panel 100 , in the sub-pixel 130X, the inclination angle α is smaller than the inclination angle β. In addition, the difference between the tilt angle α and the tilt angle β in the sub-pixel 130X is larger than the difference between the tilt angle α and the tilt angle β in the sub-pixel 130Y. In this way, by adjusting the inclination angle of the wall surface of the coating region according to the arrangement position of the sub-pixel, the deviation of the organic functional layer generated in the sub-pixel arranged at the edge of the substrate can be corrected, and the film of the organic functional layer can be corrected. Thick deviations between pixels are corrected.

FIG. 10A is a cross-sectional view along line AA of the linear application region 176a shown in FIG. 9A. FIG. 10B is a cross-sectional view along line BB of the linear coating region 176 a shown in FIG. 9A .

As shown in FIGS. 10A and 10B , this embodiment is characterized in that the inclination angle of the wall surface of the coating region 176 changes within one linear color developing region 120 . Specifically, in the sub-pixel 130 in the center of the color-forming region 120 in the line direction, the taper angle of the inclination angle of the wall surface is large (see FIG. In the pixel 130, the taper angle of the inclination angle of the wall surface is small (see FIG. 10B ).

When the material liquid of the organic functional layer is coated in the linear coating area defined by the linear bank to form a linear organic functional layer, the material liquid is sometimes pulled toward the coating area during the drying process of the material liquid. At the end of the linear direction, the film thickness of the organic functional layer in the linear direction is not uniform. However, as in the present embodiment, by making the inclination angle of the wall surface at the end portion in the line direction smaller than the inclination angle of the wall surface at the center portion in the line direction in one linear application region, it is possible to prevent the material liquid from being pulled toward the application area. The end of the line direction of the region.

Therefore, according to this embodiment, even when the material liquid of the organic functional layer is coated in the linear coating region to form the linear organic functional layer, the deviation of the film thickness in the linear direction of the organic functional layer can be corrected, Thus, an organic functional layer having a uniform film thickness along the line direction is obtained.

(Embodiment 3)

In Embodiment 3, the organic EL display panel of the present invention in which the cross-sectional shape of the pixel electrode differs according to the positions of the sub-pixels will be described.

11A is a plan view of an organic EL display panel 300 according to Embodiment 3. FIG. FIG. 11B is a cross-sectional view along line AA of the organic EL display panel 300 shown in FIG. 11A .

The organic EL display panel 300 of the third embodiment is the same as the embodiment 3 except that the inclination angles of the walls of the coating regions of the sub-pixels emitting the same-color light are the same and the cross-sectional shapes of the pixel electrodes of the sub-pixels emitting the same-color light are different. 1 organic EL display panel 100 is the same. The same reference numerals are attached to the same constituent elements as those of the organic EL display panel 100 , and description thereof will be omitted.

As shown in FIG. 11B , in the organic EL display panel 300 of Embodiment 3, each sub-pixel 130 has a concavely curved pixel electrode 450 . Here, "the pixel electrode is concavely curved" means that the surface of the pixel electrode on the functional layer side is a curved surface, and the central part is concave toward the substrate side.

Usually, the surface (the surface opposite to the counter electrode) of the organic functional layer formed by coating on the pixel electrode has a concave shape (see FIG. 2 ). Therefore, if the bottom surface (the surface facing the substrate) of the organic functional layer is flat, the film thickness of the organic functional layer in the sub-pixel will be uneven. On the other hand, if the pixel electrode 450 is concavely curved as in the present embodiment, the shape of the bottom surface of the organic functional layer 180 coated and formed on the pixel electrode 450 can be concavely curved. Thereby, the shape of the surface of the organic functional layer can be matched with the shape of the bottom surface, and the film thickness of the organic functional layer in the sub-pixel can be made uniform.

In order to form the pixel electrode 450 into a concave shape, for example, a concave portion is formed on the substrate 110 and the pixel electrode 450 may be formed on the concave portion. In order to form the concave portion on the substrate 110, the substrate 110 may also be wet-etched or dry-etched directly, or a photosensitive resin layer may be disposed on the surface where the concave portion is formed, and the photosensitive resin layer may be exposed to light. Develop and pattern the concavities.

The present embodiment is characterized in that the cross-sectional shape of the pixel electrode differs depending on the arrangement positions of the sub-pixels. More specifically, each sub-pixel 130 has a pixel electrode 450 having a cross-sectional shape matching the shape of the organic functional layer 180 that each sub-pixel 130 has. For example, in the sub-pixel 130X where the organic functional layer 180 is oriented toward the end of the substrate 110 , the pixel electrode 450 also has a shape oriented similarly to that of the organic functional layer 180 . On the other hand, in the sub-pixel 130Y where the organic functional layer 180 is not deviated toward the end side of the substrate 110 , the shape of the pixel electrode 450 is also not deviated. Hereinafter, a specific shape of the pixel electrode 450 will be described with reference to the drawings.

FIG. 12A is an enlarged view of sub-pixel 130RX shown in FIG. 11B , and FIG. 12B is an enlarged view of sub-pixel 130RY shown in FIG. 11B . As shown in FIG. 12A , the bottom point Z of the pixel electrode 450X of the sub-pixel 130RX is located on the center side of the substrate 110 relative to the center S of the pixel electrode 450X. In this way, by shifting the bottom point of the pixel electrode 450X to the center of the substrate 110 , even if the organic functional layer 180RX is biased toward the end of the substrate 110 , the film thickness of the organic functional layer 180RX can be made uniform. As a result, the film thickness T of the organic functional layer 180RX included in the sub-pixel 130RX is the same as the film thickness T' of the organic functional layer 180RY included in the sub-pixel 130RY.

On the other hand, as shown in FIG. 12B , in the pixel electrode 450Y included in the sub-pixel 130RY, the bottom point Z' of the pixel electrode 450Y is located at the center of the pixel electrode 450Y. In this way, in this embodiment, the bottom point Z of the pixel electrode 450X of the sub-pixel 130X is located on the center side of the substrate 110 than the center S of the pixel electrode 150X, and the distance between the bottom point Z of the pixel electrode 450X and the center S of the pixel electrode 450X is The interval is greater than the interval between the bottom point Z′ of the pixel electrode 450Y and the center S′ of the pixel electrode 450Y of the sub-pixel 130Y.

In this way, by matching the cross-sectional shape of the pixel electrode to the shape of the organic functional layer, the film thickness of the organic functional layer of the sub-pixels at the edge of the substrate can be made uniform. As a result, it is possible to correct the variation between pixels of the organic functional layer 180 formed by the coating method.

Also, in this embodiment, as in Embodiment 1, it is preferable that the distance between the bottom point and the center point of the pixel electrode of the sub-pixel emitting light of the same color gradually decreases from the edge of the substrate toward the dry center point. .

This application claims priority based on Japanese Patent Application No. 2009-154240 filed on June 29, 2009. All the content described in this application specification is referred by this application specification.

Industrial Applicability

According to the present invention, it is possible to provide an organic EL display panel with high brightness.

Claims (6)

1. organic EL display panel comprises:

Substrate, it has the color development zone of parallel plural wire; And

Plural sub-pixel is arranged in described color development zone the one row,

Described color development zone comprises: arranged the color development zone of the sub-pixel that sends red light, the color development zone of having arranged the sub-pixel that sends green light and the color development zone of having arranged the sub-pixel that sends blue light,

Described sub-pixel has respectively: pixel electrode, and it is configured on the described substrate; Organic function layer, its coating are formed on the described pixel electrode; Counter electrode, it is configured on the described organic function layer; And the separation levee of positive taper, it is configured for forming the wall in the zone of described organic function layer,

The angle of inclination of the wall of end side in the wall in the zone that will form described organic function layer, described substrate is set at tilt angle alpha, and when the angle of inclination that will form the wall of center side in the wall in zone of described organic function layer, described substrate is set at inclination angle beta, at the sub-pixel X of the color development zone X that is arranged in the end that is arranged in described substrate, described tilt angle alpha is less than described inclination angle beta.

2. organic EL display panel as claimed in claim 1,

The described tilt angle alpha among the described sub-pixel X and the difference of described inclination angle beta are greater than sending whole-colored light with described sub-pixel X and being arranged in the described tilt angle alpha of sub-pixel Y of color development zone Y of the central portion that is arranged in described substrate and described inclination angle beta poor.

3. organic EL display panel as claimed in claim 1,

The zone that forms the described organic function layer that each described sub-pixel has around surround by described separation levee.

4. organic EL display panel as claimed in claim 1 forms the zone that a row ground is arranged in the described organic function layer that the plural sub-pixel in the described color development zone has and constitutes by described separation levee zone that stipulate, a wire.

5. organic EL display panel as claimed in claim 4,

In the color development zone of a described wire, the angle of inclination of wall that forms the zone of the described organic function layer that the sub-pixel of the central portion be positioned at described line direction has is positioned at the angle of inclination of wall in the zone of the described organic function layer that the sub-pixel of the end of described line direction has greater than formation.

6. organic EL display panel as claimed in claim 1,

Described organic function layer comprises organic luminous layer and hole transporting layer.

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